Warm air furnace



June 22, 1937. A. w. GEARHART WARM AIR FURNACE Filed May 25, 1955rill!!! INVENTORV W @MZM ATTORN Y Patented June 22, 1937 UNITED STATESPATENT OFFICE Application May 25,

' 2 Claims.

My invention relates to a warm air furnace, and more specifically tothat form of furnace in which hydrocarbon fuel is used. With slightmodifications other forms of fuel may be used.

An object I have accomplished in my invention is the construction of afurnace having a down draft passage for excess burnt gas and smoke inwhich the maximum heat units produced by combustion within the furnaceis controlled, as against loss of a large per cent of the heat units infurnaces as now constructed. Another object is that the entire area ofthe furnace wall is used as a means to radiate heat. Other objectswillbe hereinafter disclosed.

In the drawing herewith which is hereby made a part of thisspecification, Fig. l is a front sectional view of a furnace constructedwith my invention incorporated therein.

Fig. 2 is a sectional view of the furnace, at

20 right angles to the view shown in Fig. 1, along section lines 2-2 inFig. 1.

Fig. 3 is a cross sectional view of the furnace along the sectional line33 in Fig. 1, viewing the device from the top.

Fig. 4 is a perspective view of the furnace with parts cut away to showportions of the inside of the device.

Referring to the drawing, the furnace has an enclosed chamber 6. Thischamber is shown rec- 30 tangular in form in the drawing, having fourupright walls designated 6|, 62, 63 and 64; a bottom 65, and a top orcover 66. Other shapes can be adapted to my invention. Near the bottomof wall 6| is inlet opening I for admission of fuel 5 into combustionchamber 9. The fuel preferred in the form shown in the drawing is fueloil, but natural gas, artificial gas, or any form of hydrocarbon fuelmay be used.

A flue opening 8 is positioned preferably on 40 wall 64, on a horizontalplane above the opening for the fuel intake. Wall E4 is opposite to wall6|. Flue 8 is intended for disposing of the burnt gas of combustion.

Combustion chamber 9 is located within the 45 enclosed chamber and atthe bottom thereof.

The combustion chamber consists of a bottom 9I, which can be positionedon the bottom of enclosed chamber 6, a back 92, which should bepositioned on a plane approximately parallel with 50 side 64, and aspaced distance therefrom, and ends 93 and 94, which ends should be onparallel planes with sides 62 and B3, and a spaced distance from each ofsaid sides. It is noted that the combustion chamber is open at the topand is 55 positioned so that inlet I opens into it. The

1935, Serial No. 23,444

combustion chamber is relatively high enough to be on a plane with thelower end of the flue. These relative proportions are not arbitrary, andslight changes can be made therein without departing from the spirit ofmy invention.

I have placed a bafiie plate I0 back of the combustion chamber. Thisbaille plate is preferably attached to wall 64 just above the flue andextends downwardly at an angle to the back wall of the combustionchamber, thus forming a closure for the space within the enclosedchamber which is between the wall 64 and the back 92. This baffle platefurther comprises extensions IM and I02 on each side of the combustionchamber and within the space between the combustion chamber ends 93 and94, and chamber walls 62 and 63. Such extensions end a spaced distancefrom wall 6|. The spaces, or openings between wall BI and saidextensions IIlI and I02, are designated I03 and I04.

The portion of the enclosed chamber above the baflie can be termed theupper compartment, and the portion below the baffle the lowercompartment.

The arrows I3 show the circuits naturally followed by the heatedcurrents constituting the products of combustion. It is noted thatnaturally the flame and heat produced in the combustion chamber willpass upward until it is deflected by the ceiling of the chamber. Fromthence it will spread along the lines of least resistance over the upperportion of the enclosed chamber, and then down the sides of the enclosedchamber in the upper compartment until it strikes the baffie. The onlyoutlet for the burnt gas and accompanying heat which is not radiated isin the lower compartment just under the baflle, and. the pathway suchburnt gas and heat must travel is through openings I03 and I04 then tothe back of the combustion chamber in the lower compartment, under thebaffle, and out of flue 8. It will be noted that the path of travel ofthe heat and burnt gas from the upper compartment to the lowercompartment is much longer than in furnaces of ordinary construction,and the heat is retained longer within the furnace or enclosed chamberbefore it can be released by the flue, thus giving the opportunity toradiate more heat from the products of combustion.

It is noted that the walls comprising chamber 6 are preferablyconstructed of sheet metal which is adapted to transmit heat to theoutside of the furnace. An outside wall I5 is placed around the furnacea spaced distance therefrom and the heat radiated through the metal wallof the enclosed chamber is transported by means of pipes leading fromthe space between the enclosed chamber walls and the outside wall to theplaces desired.

It is noted that the same general principles herein set forth can withslight modification for fitting the parts be applied to a tubularfurnace or those of other shapes.

The outlets for the heated air to be used are designated l 9. Thefurnace door is designated 20.

Having described my invention I claim as new and ask for Letters Patent:

1. In a furnace having a closed combustion chamber, a fire box in thelower part of the combustion chamber, said fire box being spaced fromthe sides and rear of said combustion chamber, said spaces between thewalls of the combustion chamber and the walls of the fire box beingenclosed with a sloping partition extending from the rear wall of thecombustion chamber to the upper end of the rear wall of the fire box,and transversely across said combustion chamber, said partition furtherextending along the side walls of the fire box and theside walls of thecombustion chamber to a spaced distance from the front wall of thecombustion chamber and a spaced distance from the floor of thecombustion chamber, and a flue opening from the combustion chamberdirectly under said sloping partition.

2. In a furnace having a closed combustion chamber, a fire box open atthe top, the sides and back thereof being spaced from the sides and backof the combustion chamber, and the front Wall of the fire box beingadjacent to the front wall of. the combustion chamber, said fire boxbeing located at the bottom of said combustion chamber, a baffle plateextending transversely across the combustion chamber from the top of theback of the fire box sloping upward to the back wallof the combustionchamber, and downward on either side of the fire box to within a spaceddistance from the front wall of the combustion chamber and a spaceddistance from the floor of the combustion chamber, an opening in thecombustion chamber adapted as a flue located under and adjacent to thebafile plate, and an opening in the front wall of the combustion chamberand fire box adapted to admit fuel into the fire box.

ALONZO W. GEARHART.

